Engineering Design Guidelines for Relief Valve Selection and Sizing

TABLE OF CONTENT
INTRODUCTION
Scope 5
Important of Pressure Relief System 6
Relief Devices Design Consideration 6
(A) Cause
of overpressure 6
(I) Blocked Discharge 7
(II) Fire Exposure 7
(III) Check Valve Failure 8
(IV)Thermal Expansion 8
(V) Utility Failure 8
(B) Application of Codes and Standard 9
(C) Determination of individual relieving rates 10
Design Procedure 11
DEFINITIONS 12
NOMENCLATURE 14
THEORY 16
Selection of Pressure Relief Valve 16
(A) Conventional Pressure Relief Valve 16
(B) Balanced Relief Valves 18
(C) Pilot Operated Relief Valves 20
(D) Rupture Disk 23
Standard Relief Valve Designation 26
Procedure for Sizing 28
(A) Sizing for Gas or Vapor Relief for Critical Flow 28
(B) Sizing for Gas or Vapor Relief for Subcritical Flow 30
(C) Sizing for Steam Relief 31
(D) Sizing for Liquid Relief: Requiring Capacity Certification 33
(E) Sizing for Liquid Relief: Not Requiring Capacity Certification 34
(F) Sizing for Two-phase Liquid/Vapor Relief 35
(G) Sizing for Rupture Disk Devices 35
(H) Sizing for External Fire 36
Installation 38
(A) Pressure Drop Limitations and Piping Configurations 38

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